The Billboard, p.20, August 22, 1925 Published 2022/09/14 at 1200 × 1169 in Things I learned on Phono EQ curves, Pt. 2 ← Previous Next → source <a href=httpsworldradiohistorycomhd2IDX BusinessMusicBillboard IndexIDX1925Billboard 1925 08 29 IDX 20pdf>The Billboard p20<a> August 22 1925